Receiving on a custom domain
Once your domain’s MX record points at SuperMail, mail arrives through SES and lands in the inbox. There are two routing modes.
Catch-all (default)
Every address on the domain delivers to the same inbox. So anything@yourdomain.com - including
addresses you’ve never used - shows up as a new message. This is the default for new domains and
works well for most solo users.
The “To” header is preserved, so you can filter on it:
- Search:
to:hello@yourdomain.com. - Create a rule: Settings → Rules → Tag anything to
support@as#support.
Per-alias routing
If you want different addresses to route differently (e.g. support@ to a shared inbox, you@ to
you personally), switch to per-alias mode:
Settings → Domains → [domain] → Routing → Per-alias.
Then configure each alias:
| Alias | Route |
|---|---|
you@yourdomain.com | Your primary workspace inbox |
support@yourdomain.com | Tag as #support, keep in inbox |
billing@yourdomain.com | Forward to finance@externalpartner.com |
_anything_else_ | Drop |
Anything not matching an alias is dropped when per-alias routing is on. Switch back to catch-all any time.
Plus-addressing
SuperMail supports + aliasing automatically. you+vendor@yourdomain.com delivers to whatever
routes you@yourdomain.com goes to, with the original +vendor tag preserved. Easy disposable
addresses for signups.
Size limits
- Max message size: 40 MB (SES inbound limit).
- Max attachment count: no hard limit, but total message size is the constraint.
Anything over the size limit is rejected at the SES level; the sender gets a bounce. We log the rejection so you can see it in Settings → Domains → [domain] → Bounces.
Bounces and non-delivery
If a sender mistypes your address (e.g. hallo@yourdomain.com when catch-all is off), their mail
bounces back with a standard 550 rejection. If catch-all is on, it still lands in your inbox -
expect some spam if your domain has been publicly advertised for a while.
Blocklist / spam
SuperMail runs incoming mail through SES Rcpt-based reputation filters. Known-spam senders are dropped before they hit your inbox. You can always check the Spam folder on a per-domain basis.